Lifting-jack



M. D. RIKER. LIFTING JACK. APPLICATION FILE-n nEc.2e. 1918.

1,366,332. Patented Jan. 18, 1921.

vUiNl'lEl),sfrarle:s?l

MALCOLM n.

PATENT OFFICE. RIKRR, or) DOVER, New JnRsnv, AssIGNOR 'romiucRIRAN-TERRY DRILL cOMrnNY, A CORPORATION ORNEW JERSEY. i

LIrTING-Mcx.

To all whom 'it may concern."

Be it known that I,L-MALOOLM D..RIKER, a citizenuof the United States, and resident of DoveiglMorris county, and State of N ew Jersey, have invented certain new and useful Improvements inV Lifting-Jacks, of

which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

` Thisr invention relates to new and useful improvements in lifting jacks of the screw type, and its object is to provide a device of great strength, few parts and of such construction that its parts are assembled without the use of screws, nuts or rivets.

Another object is to so arrange and construct the devicethat it may be taken apart and assembled without the use of tools.

Another object is to provide a simple and effectivestop for limiting th'elifting move- Ament of the jack.

In orderthat my invention may b e thoroughly understood I will now proceedto describe the same" in the following specification and will then point out the novel features thereof in appended claims.

Referring tothe drawings:

Figure 1 is a sectional elevation of` a jack which is made according to and embodies this invention. The plane on 'which this section is taken isindicated' by the line 1-1 of Fig.A 3..

Fig. V2 is a plan' view of the' same device.

Fig. 3 isa sectional plan view of this'im- 'rove'd'jacln the section being taken on the line .of Fig. 1.

Fig. .4 is ak sectional elevation of a ratchet mechanism whichfo'rms a part of this ap-- paratus." The section inY this figure istaken on the'line4-4 of Fig. 5.

Fig. 5 is afsectional plan view of this' ratchet mechanismillustrating the` manner in which its parts are assembled. This section is taken onl the line 5 54 of Fig. 4.

vFig.v 6 is aV sectional elevation taken on the line 6 6 of Fig. 2, to'illustrate a detail of construction,a locking pin for holding parts ofthe device together.

Fig. 7' is aI sectional elevation taken on the line 7-7 of Fig. 6 to show a lifting foot or projection. v

Like charactersy of reference designate corresponding parts in all the figures.

10v designates an inner member,the lower end 11 of which isconstructed to form a of this member iscylindrical.

Specification OfVLetters Patent. i pigmented Jan; 18, Application ined' December 2e, 191s. Aserial No. 268,347.

base. Above the base the outer surface 12 A central bore in the upper end of member 10 receives a nut 13, and keys 14 are provided to prevent rotation of this nut.

15 is a collar screwedonto the upper end of member l0having a cylindrical outer surface 16 of somewhat larger diameter than that ofthe surface 12, and a lower beveled end 17. Y

The lifting screw 20 fits lthe nut 13 and extends through the inner member 10. 21 is an upper cylindrical extension of the lifte ing screw near the upper end of which is an annular groove 22. 23 is a worm gear surrounding .the extension 21` and connected `with the lifting screw by keys 24. Above gear 23 is an anti-friction thrust bearing 25.

The outer member comprises a cylindrical shell 30, the lower inner part of which is turned to formv acylindrical surface 3l which forms a sliding fit `with ther surface 12. Above this surface is a longer finished cylindrical surface 32 which forms a'sliding fit with the collar surface 16. Between the surfaces 31 and 32 is a beveled shoulder 33. i

The upper end of the outer member forms ahead 34 in the center of the under side of which is a cylindrical pocket which receives the extension 21. Below this head is an Opening 35 slightly widerlthan the diameter of the gear 23 and higher than the diameter of the worm 50. 36' is a plate of spring metalV which closes this opening and is retained in position byy its vertical edges being sprung into grooves 37 at the sides of the opening. At 38 the' metal of the outer member is cut away to afford a finger hold on thev plate; By bending. the plate outwardly into the position indicated by the dotted lines at 36A.l in Fig. 3, it .may be removed. 39 are lugs formed under the head `the axis B, BV to form a bearing for. a

smaller part 52 of the same spindle. The

VouterV member, and a springmetal plate arranged toi-cover said opening, the outer member having grooves at the edges of'said opening into which the cover plate is sprung and by which said cover plate is retaine in position.

3.' A lifting jack.k comprising an inner member havingianut, :an outer member slidably supported on thevinner member, a lifting' screw engaging thewnutv and rotatively Vconnected with the outer member, a 1

worm gear within the outer member nonrotatively connected with said screw, a worm within the outer member, a part of said outer member forming a` housing in-v closing said worm having spaced walls, a circular bearing through one ofV said walls, and a bearing pocket in alinement therewith in the other wall, a larger bore through the rst wall having its axis oblique to that ofsaid bearing, said bearing pocket being cut away semi-cylindrically in axial alinement with said larger bore, a circular boss on the worm fitting the bearing pocket and a bore in the other end of the worm in alinement with said boss, and a spindle having parts Vof different diameters, .the part of larger diameter being arranged to be thrust through said larger bore -inv said wall into the bore of the worm, the part of smaller diameter being arranged to it the bearing in said wall, and a shoulder formed on the spindle between the partsV thereof ofdifferent diameters for engaging the inner surface of said wall.

4c. A lifting jack comprising an inner member having a nut, an outer member slidably supported on the inner member, a lifting screw engaging the nut androtatively connected with the'outer member, a worm gear within the outer member non-rotatively con ected with said screw, a worm within the outer member, a part of said outer member forming a housing inclosiiig said worm having spaced walls, a circular bearing through one of said walls, and a bearing pocket in alinement therewith in the other wall, a larger bore through the first wall having its i axis oblique to that of said bearing, said bearing pocket being cut away semi-cylindrically in axial alinement with said larger bore, a circular boss on the worm fitting the bearing pocket and a bore in its other end of the worm in alinement with said boss, and a spindle having parts of different diameters, the part of larger diameter being arranged to be thrust through said larger Vbore in saidgwall into the bore ofthe Worm,

the part of smaller diameter bein arranged to lit the bearing in said wal and a shoulder formed on the spindle between the parts thereof of different diametersfor engaging the innersurface of said wall, said outer member being construoted with an opening through the side thereof opposite said housing, through which the gear and Worm may be placed within the outer member.`

5. A lifting vjack comprising an inner member having a nut, an outer member slidably supported on the inner member and having an upper transverse head, a lifting screw engaging the nut having an upper extension of reduced diameter provided with an annular groove, a worm gear surrounding said extension and lwithin the outer member, znonrotatively connected 'with' said screw, a worm withinV and supportedV by the outer member, said outer member being constructed with an opening through which the `worm and gear may be placed within the outer member, and a transverse slide under said head arranged to be moved into said annular groove.

6. A lifting jack comprising an inner member having a nut, an outer member slidably supported on the inner member and having an upper transverse head, a lifting screw engaging the nut having an upper extension of reduced diameter provided with an annular groove, the under side of said head being constructed to form a pocket for the reception of the upper end of the extension, a worni gear surrounding said extension and within the outer member, non-rotatively connected with said screw, a worm within and supported by the outer member, said outer member being constructed with an opening through a sidev thereof through which the worm and gear may be placed within the outer member, and a transverse slide in said head arranged to be moved into said annular groove. 1

7. A lifting jack comprising an inner member having a nut, an outer member slidably supported on the inner member and having an upper transverse head, a lifting screw engaging the nut having an upper eX- tension of reduced diameter provided with an annular groove, the under side of said Vmay be placed within the outer member, a

part of the inner member having a ey1in-V transverse slide in said head arranged to be moved into. said annular groove, and a nonposltive stop for said sl1de.

84A lii'ting jack comprising an in iier member having a Vprojecting portion form--y drical ,surface fitting said larger cylindrical surface of the outer member and having a'lovver beveled surface in the path of movement v of said shoulder to thereby engage thevbeveledy shoulder and stopv further' movement-ofthe members Without upsettingthe metal ofthe abutting parts, a lifting screw l engaging the nut and rotatively connected with the outer member, a worm gear nonvrotar-tively connected Withfsaid screw, and

a iv'orm in mesh AWith said gear.l

9. A liting-jack oomprising vtelescopieally-'engaged-members, a screw for shifting eneV member. lover .the otherl Yand provided with an annularv groove in 'the end thereof,

one of said members .having a headprovided with a seat orsaid end of the screw and a radial passage entering said seat andhavmg a. recess 1n one side thereof and a transverse slide enteredin the radial-passage into engagement withv the annular groove inthe enuof the screw and provldejd with a hump 315KV i engaging in the recess to removably secure the slide in position.;

In Witness whereoil have hereunto set L my hand this 21st dayrof December, 1918.

` MALCOIM D. BIKER. 

